QuestionQUESTION: For some reason my 4WD just stopped working. When I engage the transfer drive both rear wheels turn but nothing in the front turns. There is no hubs to lock, I don't think...is it something serious or am I just missing something simple?
ANSWER: What year/model is it and does the 4x4 light on the dash turn on?
---------- FOLLOW-UP ----------
QUESTION: Sorry, I have a 95' toyota 4Runner 6cyl. and yes the dash light comes on.
ANSWER: When slowly driving forward does the front driveshaft turn and do the front axles turn? It uses automatic locking hubs, the locking function is built into the front differential where an actuator engages and locks the front axles to the differential providing front wheel drive, the light on the dash is turned on by a switch in the differential when 4x4 is engaged so it seems that the actuator is working.
---------- FOLLOW-UP ----------
QUESTION: In my search for a solution I checked the fluid in both diff's and the transfer case and both are in excellent condition. I also checked to see if the front drive shaft turns in 4WD and it does...so the final issue must be, are the automatic hubs locking when the actuator is telling them to. If I take the wheel off is there something I can inspect to see if the hubs are engaging? Is there anything else I can do?
AnswerThe hubs at the end of the axles are always locked, the locking/unlocking takes place at the iside ends of the axle shafts, it uses the ADD(auto disconnect differential) system. There is an actuator attached to the front differential which is vacuum operated by an electric solenoid, check the vacuum lines, the actuator may need to be removed and tested by applying vacuum to the ports, the only thing that is a little confusing to me is why the 4x4 indicator light would turn on if the actuator was not working since the switch is located directly on the shift fork for the actuator that engages the front wheel drive.
